mid-60s for downtown san francisco. we are expecting some changes are will tell you about it coming up. >> oath of office. it's a private ceremony being held at the white house. as mandated by the constitution. >> and i do solemnly swear that i will faithfully execute the office of the president of the united states. >> new video in this morning shows the president and vice president joe biden at a wreath laying ceremony at arlington national cemetery. but tomorrow. the big celebration happens. a ceremony. which we will carry live. there have been a thousand details for organizers to consider. here's kron four's catherine heenan with more. a few facts about how these crowds will be handled. the u.s. military will be helping park police for the first time ever. the secret service will be working with 57 federal and local agencies. a new app is designed to keep people from getting lost or stuck in overcrowded spots -- which happened in 2009. there's continued concern over whether there will be enough porta-potties. also -